Guakd eob dope-locks



To all it madman.-

. wIntmMrn naur AND FRIEDERIGH unrn, or CINCINNATI, OHIO.

V .,GUABD non noon nooKs.

sp tifi at pn Letters Patent No. 12,47 dated March e, 1855,

Be itiknown that .we, WILLIAM 'BALLA-UF [and Ftm mm WUnrH, both of Gincinnati,j .Hamiltoncounty; State of Ohio, have ini fventedi anew and useful Safety Stopper or GuardforIJDoor-Locks and we dohereby;

I declarethefollovv ingito be afull, clear and, exact description thereof, reference beingi ofthis specification.

i The object of. our

had tothefannexeddrawings, making part} invention is to provide a conveniently portableinstrument by means 1 of which, the keyholeof any Ordinary door;

lock can be renderedfltemporarily inacces-l sible, the instrume t beingremovable byjthe i same key which fastensi.

tenanted,andtis especially adapted to 111161 {safeguard to stores, banks or oifices when unwantsof travelers, who are constantly 001m pelled to 'leave valuable baggage under the precarious protection. ,of a lock; fitted by other keys in the same building.

3 In the. accompanying drawings Figures" 1, 2 and [are axialsections of a guard to a scaledouble ofreality. Fig. 4 is a perspeo tive view exhibitingaguard as presented for insertion fromthe outside of the door. Fig.

5 represents a guard in position within the keyhole. Fig. 6 represents by axial section (double the reality) a guard with another arrangement of tumblers, andliaving its key inserted. Fig. 7 represents in like manner {view of "the screw spindle or'pin and Fig. 9

a guard without the key. Fig. 8 is an end of the key belonging to the last named form. jy fThe instrument consists of thefollowing principal parts and their accessories.

taperingandscrew threaded spindle 1(a),

' )adapted tofit and to be screwed fast within the eye of a door-keyho1e of any usual size.

This spindle is also scored with a groove i (1 )]sunknear1yor quite to the depth ofthe thread either longitudinally or spirally as represented the latter. form being preferred.

a The object of-thisrgroove is to facilitate the engagementof the screw Within thekeyhole The spindle has a rounded shank 2 which occupies one endof a cylindrical Socket orbarrel (b).

(0) is ahollow rectangular case project ing from one side of the barrel, and styled by us the bit. -This bit contains one or more tumblers which maybe of the form represented at (03).: A number of them may be made coincident in shape, with the single "tumbler, (The rear tumbler being coincidentin shape with thefront one except in the position of the spur8-that is the only part visible in the illustration.) The front end of each tumbler is confined to a longitudinal motion by a pin (g) which projectn r ing from the case occupies a slot (6) in each Theinstrumentisuseful as an additional the proper distance by means of the channel (12).o n the key stem (whose depth is carefully adjusted for that purpose). The horizontal portion of the slot then permits the tumblers to be advanced longitudinally, by

pressure of the end (8) and groove edge (9) of the key, respectively, against the spurs ,(3 and 3). This action brings the lugs (5) clear of the notches (4:, 4,) and into the eccentric channel (10) around the spindle shank. If the true key has been employed, the lugs (5) and the spurs (3 3) then 'ocupy three distinct channels in the spindle-shank and key, namely, the channel (10)just referred toin the spindle shank, the channel (9) in the. key and anotherchannel (11) formed by the opposing and parallel shoulders of thekey and spindle. These channels have all the same 'everted .form and position as represented. The notches (4 4) arerepeat-ed for a short distance in front of the channel (10).

exception of theposition of the spur (3 Hence if a key be employed which pushes the tumblers either too far or not far enough it is impossible to rotate the spindle.

mencement ofthe advancing pressure, the rear ends of thetumblers are lifted neither less nor more than the exact height of the horizontal slot. Another element of securitysin this guard is derived from the eccentrio channels or grooves of the spindle and.

key in their concerted action upon the different parts of a single tumbler. The action of these channels is to impart to the tumblers a short sliding motion to and fro in the act of rotating the spindle and all. the channels being parallel, to each other, the dent and spur on each tumbler have an unrestricted motion in their respective channels. Should on the other hand a key be applied whose channels were either more or less eccentric it would evidently be impossible to rotate the spindle, either the key being detained by the resistance of the spurs against the channel side or by the re-entering of the lugs or dents within the notches of the spindle.

The rotation of the spindle by the key may be effected by means of a crotch (13) a which on the advancement of the key en gages a spud (14) upon the spindle shanki or a pin and socket may be employed as in Figs. (8 and 9).

The bit or case (a) should approximate in form and size to the slot of an ordinary keyhole so as, in conjunction with the screw spindle, to so occupy the keyhole as effectlb (7:) adapted to the slot of an ordinary keyhole; in combination with the cylindrical socket (b) and tapering screw threaded spindle (a) substantially as set forth,-

adapted to the eye of the keyhole, and which spindle, -by means of a suitable key (Z) as herein described-can be screwed within or unscrewed from the keyhole ;-the rotation of the screw, by any other than the proper key, being prevented by the described tumblers (d) or their equivalents.

2. The sliding and vibrating tumbler (or tumblers) (d) provided with a locking dent or lug (5) catching within a notch (4:) in the spindle shank, and disengaged therefrom by the combined agencies of the channeled and sliding key (Z), elevating pin or piston (2'), longitudinal and T slots (6) (7), and stationary pins (g) (h) substantially as described; the tumbler, on the withdrawal of the key relocking by means of a suitable spring.

3. In combination with tumblers substantially as represented,the longitudinal notches (4) (4), extending on both sides of a transverse or eccentric channel (10) around the spindle shank.

4E. The eccentric and parallel channels (9) 1 (10) (11) around the spindle shank and key stem; acting simultaneously upon both dent and spur of each tumbler, after the manner and for the purposes set forth.

5. The tapering, spirally scored spindle in this connection.

In testimony whereof, we hereunto set our hands before two subscribingwitnesses.

WILLIAM BALLAUF. FRIEDERICH W'URTH.

Witnesses Gno. H. KNIGHT, THos. W. Soorr.

screw threaded and 

